
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
    <div id="app">
     <ul>
        <li v-for="(item,index) in list" :key="item.id">{{ item.text }}
            <button @click="change(item.id)">删除</button>
        </li>
     </ul>
     <button @click="add">生成</button>
    </div>
 
</body>
<script src="./vue.js" ></script>
<script>
   const app = new Vue({
    el:'#app',
    data:{
      list:[
        {id:1,text:1},
        {id:2,text:2},
        {id:3,text:3},
      ]
    },
    methods:{
        change(id) {
           this.list = this.list.filter((item)=>{
            return item.id != id
           })
        },
        add() {
            let num = Math.floor(Math.random() * (20 + 1))
            const obj = {
                id: this.list.length+1,
                text:num
            }
            this.list.push(obj)  
        }
    }

   })
</script>
</html>